What is the difference between TD42LC and TD42?

The TD42LC is designed for smaller condensate loads typical in mains drainage, while the TD42 handles larger process-type loads. The TD42 is also available in 1" size, whereas TD42LC is available only up to ¾".

When should I use the anti-air-binding disc variants (TD42LCA/TD42A)?

Use the anti-air-binding variants when air venting during system start-up is critical. Note that these variants require a higher minimum inlet pressure (0.80 bar g vs 0.25 bar g) and have a lower maximum operating temperature (255°C vs 400°C).

Is IBR certification included with this product?

IBR certification is available but must be specified at the time of order placement. The product complies with Indian Boiler Regulations, 1950.

What is the recommended installation orientation?

The TD42LC and TD42 should be installed in the horizontal plane with a small drop leg preceding them to ensure proper condensate collection and trap operation.

Are spare parts available for field maintenance?

Yes, spares include disc packs, strainer screen and gasket kits, strainer cap gaskets, and optional insulating covers. The trap is designed for in-line maintenance without complete replacement.

SPIRAX SARCO · STEAM TRAPS

Spirax Sarco TD42LC and TD42 Thermodynamic Steam Traps – IBR Certified

Name: Spirax Sarco TD42LC and TD42 Thermodynamic Steam Traps – IBR Certified
Brand: Spirax Sarco

Spirax Sarco TD42LC & TD42 thermodynamic steam traps for mains drainage & process loads. IBR certified, stainless steel. Get quote from PC Engineering.

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Overview

The Spirax Sarco TD42LC and TD42 are maintainable thermodynamic steam traps designed for reliable condensate removal in steam systems. These traps operate on the thermodynamic principle, using the difference in velocity between steam and condensate to open and close a single disc element, ensuring efficient drainage without waterlogging.

The TD42LC is engineered specifically for relatively small condensate loads, making it ideal for steam mains drainage applications. For larger process-type condensate loads, the TD42 variant is recommended. Both models are available with an anti-air-binding disc option (TD42LCA and TD42A) for applications where air release is critical during system start-up.

These steam traps are manufactured to comply fully with Indian Boiler Regulations (IBR), 1950, and are available with manufacturer's Typical Test Report and IBR certification upon request.

Key Features

Maintainable design with replaceable internal components
Thermodynamic operating principle for reliable steam/condensate differentiation
Stainless steel construction for corrosion resistance and durability
Anti-air-binding disc variants available (TD42LCA, TD42A) for improved air venting
IBR certified for compliance with Indian regulatory requirements
Optional insulating cover to protect against heat loss in adverse weather conditions
Compact design suitable for horizontal installation with drop leg
Maximum operating pressure up to 42 bar g

Specifications

Parameter	TD42LC / TD42LCA	TD42 / TD42A
Sizes Available	⅜", ½", ¾"	½", ¾", 1"
Pipe Connections	Screwed BSP or NPT	Screwed BSP or NPT
Body Design Conditions	PN63	PN63
Maximum Allowable Pressure (PMA)	63 bar g @ 100°C	63 bar g @ 100°C
Maximum Operating Pressure (PMO)	42 bar g	42 bar g
Maximum Operating Temperature (TMO)	400°C @ 42 bar g (standard) / 255°C @ 42 bar g (anti-air-binding)	400°C @ 42 bar g (standard) / 255°C @ 42 bar g (anti-air-binding)
Minimum Operating Temperature	0°C	0°C
Minimum Inlet Pressure	0.25 bar g (standard) / 0.80 bar g (anti-air-binding)	0.25 bar g (standard) / 0.80 bar g (anti-air-binding)
Maximum Operating Backpressure	80% of upstream pressure	80% of upstream pressure
Body Material	Stainless Steel ASTM A743 CA 40	Stainless Steel ASTM A743 CA 40
Cap Material	Stainless Steel ASTM A582 416	Stainless Steel ASTM A582 416
Disc Material	Stainless Steel AISI 420	Stainless Steel AISI 420
Strainer Screen Material	Stainless Steel AISI 304	Stainless Steel AISI 304
Size	A (mm)	B (mm)	E (mm)	G (mm)	H (mm)	Weight (kg)
⅜"	41	78	55	85	20	0.80
½" LC	41	78	55	85	20	0.75
¾" LC	44	85	60	100	20	0.95
½"	41	78	55	85	41	0.80
¾"	47	90	60	100	41	1.00
1"	53	96	66	100	41	1.50

Applications

- Steam mains drainage (TD42LC preferred for smaller loads) - Process equipment condensate removal - Heat exchangers and heating coils - Steam tracing lines - Jacketed vessels and tanks - General industrial steam systems requiring IBR-compliant components - Applications in pharmaceutical, chemical, textile, food processing, and power plants

Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for Spirax Sarco TD42LC and TD42 Thermodynamic Steam Traps. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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